Bending strength of spruce glulam

Frese, Matthias; Blaß, Hans Joachim

doi:10.1007/s00107-009-0316-2

Cited by 18 publications

(10 citation statements)

References 3 publications

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“…As a result of the high costs of such investigations the size effect of GLT beams out of Norway Spruce is usually investigated experimentally up to certain dimensions (e.g. Schickhofer [42] tested GLT beams up to 9.5 m span, Aasheim and Solli [1] up to 10.8 m span, Frese and Blaß [24] with 9.0 m span, Frese et al [25] with 10.8 m span). An exception are the investigations performed by Moody et al [36], who tested Douglas-fir beams up to 19.5 m span.…”

Section: Beam Dimensions -Size Effectmentioning

confidence: 99%

“…In the framework of a PhD project conducted at ETH Zurich [16], 24 GLT beams (b Â h Â l ¼ 115 Â 320Â 6000 mm) with well-known beam setup were produced and tested under 4-point bending. From the GLT beams (a) the position and E dyn;F of each timber board, (b) the position of each FJ, and (c) the position and tKAR-value of each knot cluster are precisely-known.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

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Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Fink

Frangi

Köhler³

2015

Engineering Structures

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Section: Beam Dimensions -Size Effectmentioning

confidence: 99%

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Fink

Frangi

Köhler³

2015

Engineering Structures

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“…T-classes), the tensile strength of finger joints is indeed an issue, since failure on the tension side of glulam beams loaded in bending very often occurs in finger joints (Fink et al 2015). Frese and Blass (2009) presented a research indicating that higher characteristic tensile strength of finger joints than required at the time is necessary in order to produce glued laminated timber (GLT) that meets the strength requirements. Current requirements on characteristic strength of finger joints for different GLT strength classes are specified in EN 14080.…”

Section: Finger Joints In Structural Timbermentioning

confidence: 99%

Increased yield of finger jointed structural timber by accounting for grain orientation utilizing the tracheid effect

2019

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Finger joints in structural timber and glulam lamellae are often used to enable production of long members or to allow for re-connection of parts of a member after removal of weak sections. According to the European Standard EN 15497, certain margins are required between knots and a finger joint in structural timber, which means that a considerable amount of clear wood becomes waste when finger joints are applied. The purpose of this paper was to investigate the possibility of reducing the quantity of waste using different criteria for placement of finger joints. The investigation was based on (1) application of methods of colour scanning and tracheid effect scanning to detect knots and grain disturbance on board surfaces, and (2) interpretation of the requirements of EN 15497 regarding where finger joints may be placed. The standard's requirement when producing finger joints is that the minimum distance between a knot and a finger joint is three times the knot diameter. The standard allows for the minimum distance between a knot and a finger joint to be shortened to 1.5 times the diameter when the local fibre orientation is measured. Utilizing this in simulated production resulted in reduction of waste from 7.4 to 4.0%, when using finger joints simply to produce timber of long lengths. If finger joints are also used to re-connect parts of members after removal of weak sections, even larger savings can be made. Furthermore, it is concluded that knowledge of fibre orientation obtained from scanning could be used not only to decrease the waste in production but also to increase the quality of finger joints.

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“…Neuere Untersuchungen von FRESE und BLAß [4,5] verwenden Schichtholz aus Buche (Fagus sylvatica) ausschließlich oder in Kombination mit Fichte (Picea abies) für tragende Anwendungen. Erwartungsgemäß zeigten die Traglasten und Steifigkeiten gegenüber BSH aus Nadelholz höhere Werte.…”

Section: Aufsatz Articleunclassified

Kunstharzpressholz zur Verstärkung von Brettschichtholz

Haller¹,

Heiduschke²,

Putzger³

et al. 2015

Bautechnik

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Compressed laminated wood for the strengthening of glued laminated timber Glued laminated timber girders were investigated, which were strengthened with compressed laminated wood at the tension lamella and optionally also at the compression lamella to increase load-bearing capacity and stiffness. Compressed laminated wood is a wood composite consisting of beech (Fagus sylvatica) veneers, which are impregnated with phenol-resorcin resin. Compressed laminated wood possesses a YOUNG's modulus of more than 20 000 N/mm 2 and a bending strength of more than 200 N/mm 2 , which is compared to glued laminated timber GL24h a doubling and a tripling, respectively. The strengthening of the GL24h girders with compressed laminated wood led to a doubling of the bending capacity and to an increase of stiffness of about one third compared to plain GL24h girders with the same cross section. Moreover, the joint of glued laminated timber and compressed laminated wood was exposed to wetting-drying cycles to investigate the durability. Partly impregnated compressed laminated wood absorbed a lot of moisture and swelled heavily, but still less than plain beech wood. Thus, this material is only recommendable for the service classes 1 and 2. Completely impregnated compressed laminated wood showed only very low moisture uptake and swelling and can be applied also in service class 3.

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Bending strength of spruce glulam

Cited by 18 publications

References 3 publications

Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Increased yield of finger jointed structural timber by accounting for grain orientation utilizing the tracheid effect

Kunstharzpressholz zur Verstärkung von Brettschichtholz

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